APA (7th ed.) Citation
Swindoll, C. R. (1981). Commitment: The key to marriage. Multnomah Press.
Chicago Style (17th ed.) Citation
Swindoll, Charles R. Commitment: The Key to Marriage. Portland, Oregon: Multnomah Press, 1981.
MLA (9th ed.) Citation
Swindoll, Charles R. Commitment: The Key to Marriage. Multnomah Press, 1981.
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